Michael,
After looking at your first post, I was wondering how you could forget Vue.
Now I see that you have them in alphabetical order. Phew!
As you know from other posts, I too am a convert to Vue 6 Infinite. I've looked at, used and trialed some of the others over the years (Artlantis, Blender, Cinema 4D, o2c Interactive, SketchUp, Truespace, Visual Reality, and the rendering programs that came with DataCAD 5 thru DataCAD 9 and DataCAD Plus-Arcon), and Vue is the best for me partly because it is more than just a rendering program, it is relatively inexpensive and it is very versatile.
I think that Kerkythea is a great rendering program and you can't beat the price, but that's all it is. When I switched to Vue, I was ready for a program that did a little more, especially in the "plant" area.